CRM 2013 - RU1 - Business Rules: Problems with decimal values

Hello,

I'm working with CRM 2013 on-premise with an installed RU1. I have some trouble with the business rules, because I can't set the exact value of a decimal field. If I try to set the value, the decimal part is cut off.

Example:

The business rule says: IF ... THEN fieldValue = 1,5

But the result in the field is 1,0

So it seems not possible to set a decimal value with a business rule. Do you have some ideas how to solve this issue?

Thanks a lot!